EP 0959376 A3 20001115 - Wavelength tunable filter device
Title (en)
Wavelength tunable filter device
Title (de)
Wellenlängenabstimmbare Filtervorrichtung
Title (fr)
Dispositif de filtrage accordable en longueur d'onde
Publication
Application
Priority
JP 13880398 A 19980520
Abstract (en)
[origin: EP0959376A2] A wavelength tunable filter device has at least two optical fibers through which an optical signal is input or output; a wavelength selective element which the optical signal is input to and output from through a lens and which selects a wavelength; a mounting jig to which the wavelength selective element is fixedly secured; a rotating mechanism, having an ultrasonic motor and an encoder, for rotating the wavelength selective element; and a motor controller for controlling the ultrasonic motor for driving, wherein the mounting jig is rigidly mounted directly to a rotating shaft of the ultrasonic motor, and the amount of power that does not exceed the driving power necessary to cause the ultrasonic motor to start rotating from a stopped condition is intermittently applied to the motor controller. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP US)
G02B 6/2931 (2013.01 - EP US); G02B 6/29311 (2013.01 - EP US); G02B 6/29314 (2013.01 - EP US); G02B 6/29395 (2013.01 - EP US); G02B 6/4215 (2013.01 - EP US)
Citation (search report)
- [A] US 5420416 A 19950530 - IIDA MASANORI [JP], et al
- [A] EP 0545735 A1 19930609 - SHARP KK [JP]
- [A] EP 0682278 A1 19951115 - BRITISH TELECOMM [GB]
- [A] US 5377286 A 19941227 - IIDA MASANORI [JP], et al
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0959376 A2 19991124; EP 0959376 A3 20001115; EP 0959376 B1 20080319; DE 69938375 D1 20080430; DE 69938375 T2 20090416; JP 3895868 B2 20070322; JP H11326642 A 19991126; US 2002071634 A1 20020613; US 6430340 B1 20020806
DOCDB simple family (application)
EP 99109860 A 19990519; DE 69938375 T 19990519; JP 13880398 A 19980520; US 31503099 A 19990520